+=item S<B<-d >I<PATH>> | S<B<--dir=>I<PATH>>
+
+Specify base directory of source files. All files will be indexed
+relative to this point.
+
+If not specified, defaults to the first non-option argument on the
+command line. Note that to avoid ambiguities, if more than one
+directory is specified on the command line, the base directory must
+be specified explicitly.
+
+All files indexed must be under the base directory.
+
+=item S<B<-f >I<FILE>> | S<B<--database=>I<FILE>>
+
+Database file to use. If not specified, defaults to
+a hidden file called B<".id3fs"> under the base directory.
+
+=item S<B<-e >I<EXT1,EXT2>> | S<B<--extensions=>I<EXT1,EXT2>>
+
+File extensions to consider when indexing.
+Defaults to B<.mp3>, B<.ogg> and B<.flac>.
+